Tech & Math

Topic Image Rail

At a wearer’s command, an electric current can switch these sunglasses from dark to clear in about a second.

This contact lens (right), about the size of a U.S. quarter, can magnify a wearer’s vision 2.8 times. Such lenses would let a patient switch, in the wink of the eye, between normal and magnified vision.

Zhong Lin Wang (left) and Jun Chen (right) of Georgia Tech show their team’s new self-powered keyboard, which can lock out unauthorized users.